Improvement in mechanisms for operating ventilators



116 4 8 3 PATBNTBDJUN 2'? 1871 TENT @Prion ABRAHAM L. PENNOCK, OF PHILADELPHIA, PENNSYLVANIA.

To all whom it may concern:

Beit known that I, ABRAHAM L. PENNOGK, of Philadelphia, county ot' Philadelphia and State of Pennsylvania, have invented Mechanism for Operating the ventilators oi' Hot-Houses, Ste., of which the following is a speciiication:

My invention consists of mechanism, too fully explained hereafter to need preliminary descriphouse, and E is one ot the glazed Ventilatingframes adapted to an opening in the root' D, and having its upper edge hinged to the beam A, the lower ed when the frame is depressed, resting on the longitudinal beam B.

In hot-houses there is generally a row of these Ventilatingdrames, which has to be opened or closed periodically, as circumstances may require. For operating these frames different devices have been employed, all demanding tedious manipulation, which it is the object ot' my invention to avoid.

To the longitudinal beam B, adjacent to each Ventilating-frame, I secure a plate, a, carrying a grooved pulley, b, over which passes a chain or cord, d, one end of the latter being secured to a 'horizontal rod, F, which extends through the building, the other end being attached to the lower end ot' the rod G, the upper end of which is jointed to the ventilating-irame, In connec-` tion with' the rod F are appliances by which the rod can be moved to and i'ro and retained in any position to which it may be adjusted, a simple handle, H, Vbein g in the present instance used for this purpose, the said handle having an internal screw-thread, adapted to an external thread on the rod, so that, on turning the handle, the hub ot' which bears against one of the end posts of t-he building, the rod F may be operated as desired.I On moving this rod in the direction of the arrow,

it is adjusted.

Specification forming part of Letters Patent No. 116,483, dated June 27, 1871.

Fig. 1, the chains or cords d will be drawn over the pulleys b, and all the Ventilating-trames will be raised simultaneously and to the sa-me extent, and will be retained in this elevated position as long as the rod is retained in the position to which 0n moving the rod F, however, in a direction contrary to that pointed out by the arrow, all the frames will I'all bytheir own weight. To provide against any sticking ofthe frames in an elevated position when it is desired to lower the whole, I sometimes connect one end of a cord or chain, l1., to the rod F, and, passing the same underthe grooved pulley b, attach its opposite end to the ventilating-trame, so tl1at,-on moving the rod F so as to lower the frames, the cords or chains lzI must necessarily pull them down. For the convenience of readily adj ustin g the mechanism so that the whole ot' the frames may be simultaneously raised and lowered precisely alike, and to the same extent, I secure the cords or chains t-o arms i, whichare adjustableon the rod F.

l.l do not desire to restrict myseltl to any speciiic mechanism for operating and retaining the rod F, as various devices may be used for that purpose. Nor is it absolutelyT necessary that a rigid rod, F, should be used, as a wire, or even a rope, would answer the purpose. In case, however, a wire or `rope be used in pla-ce ot' the rigid rod, the cords 'or chains It -will have to be dispensed with, or be so connected to an endless wire or rope passing around pulleys that both the said cords h and the cords d can be operated by a direct pull ofthe endless wire or rope.

I claim- The combination of an adjustable rod, F, or its equivalent, with a series ot hinged Ventilatingi'rames, and with mechanism substantially1 as herein described, by which the horizontal adjustment of the said rod or its equivalent will be the means of simultaneously raising or lowering the said fra-mes.

In testimony whereof I have signed my name to this specification n the presence of two subscribing Witnesses.

ABRAHAM L. PENNOCK.

l Witnesses:

WM. A. STEEL, JNO. B. HAnDlNG. 

